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This year, the world’s largest social network will see a decline among teen users in the U.S., according to a forecast by EMarketer. It’s the first time the research company has predicted a fall in Facebook usage for any age group.

EMarketer predicts 14.5 million people from the ages of 12 to 17 will use Facebook in 2017, a drop of 3.4 percent from the prior year. Teens are migrating instead to Snap Inc.’s Snapchat and Instagram, the photo-sharing app that Facebook owns, the research company said Monday in a statement.

Facebook has continued to grow around the world, with more than 2 billion users this year, but younger people are finding it less compelling, said Oscar Orozco, a forecasting analyst at EMarketer. The company needs to attract younger users so they build a Facebook habit that will carry into their adult years, when they become prime customers for Facebook advertising.